Develop Reference

Maintain aspect ratio of a video when resizing the browser

I'm working on a Video editing tool, and I need to maintain the 16:9 aspect ratio of the video when resizing the screen horizontally and vertically. So far I got it to work as expected when resizing horizontally, and when resizing down vertically, but can't get it to work when sizing up vertically. The Javascript code I used to calculate the height of the video and resize it is below (notice how the else clause is empty because that's where the code should go):
const calculateHeight = () => {
// Get the other elements on the page
const header = document.querySelector('.main-navigation');
const meshTopBar = document.querySelector('.mesh__top-bar');
const footer = document.querySelector('.mesh__bottom-bar');
// Get the section to apply the window height to it
const mainSection = document.querySelector('.insert-level-container');
// Get the video elements
const editor = document.querySelector('.mesh__insert-editor-container');
const video = document.querySelector('.mesh__insert-editor-video-container');
// Apply the height to the main section by calculating the window height minus the other elements' height
if(mainSection !== null) {
mainSection.style.height = (window.innerHeight - header.offsetHeight - meshTopBar.offsetHeight - footer.offsetHeight) + 'px';
}
// This should be the ideal height for the video
video.style.minHeight = ((video.offsetWidth * 9) / 16) + 'px';
// If the video height is bigger than the section height (calculated above), then resize it
if(video.offsetHeight + 115 > mainSection.offsetHeight) {
video.style.minHeight = video.offsetHeight - 1 + 'px';
editor.style.maxWidth = video.offsetHeight * 16 / 9 + 'px';
} else {
// This is where the logic for the vertical resizing should go
}
}
The relevant CSS for these items is:
.mesh__insert-editor-container {
margin-left: auto;
margin-right: auto;
}
.mesh__insert-editor-video-container {
position: relative;
width: 100%:
}
And the HTML:
<section class="mesh__insert-editor-container flex__one flex-container flex-column horizontally-left-aligned" id="video-main-container">
<div class="mesh__insert-editor-video-container flex-container horizontally-right-aligned flex-wrap">
<video class="mesh__insert-editor-video-placeholder"></video>
</div>
</section>
All this code is:
Get the height of all the elements on the page, sum them and calculate the main section height by subtracting that height;
If the video height gets bigger than the section height, I reduce its height by -1px each time the window gets resized, and calculate the new width.
All the above code is giving me this result, which works great for most scenarios, but I need the video to size up when the condition on the if statement is not met. Everything I tried inside the else statement gets "jumpy".
Any better alternatives to solve this would be much appreciated. Thanks all!

The CSS aspect ratio trick might be a good solution: https://css-tricks.com/aspect-ratio-boxes/
The approach takes advantage of a quirk in CSS where padding based on a percentage value will be relative to the element's width. Create a container using this trick, the important bit is this line:
padding-top: calc(9/16 * 100%);
The value is calculating the correct height based on the aspect ratio you want (9 tall over 16 wide in this case) and generating it relative to the width of the element by multiplying by 100%.
With the container maintaining aspect ratio, just place the content inside an absolute positioned inner div and you should be good. This solution is fully responsive at that point.
* { box-sizing: border-box }
.outer-max-width {
max-width: 960px;
margin: 0 auto;
}
.aspect-ratio-box {
width: 100%;
padding-top: calc(9/16 * 100%);
position: relative;
border: 2px solid red; /* for demo visibility, remove */
}
.aspect-ratio-box-content {
position: absolute;
width: 100%;
top: 0;
left: 0;
border: 2px solid blue; /* for demo visibility, remove */
}
.video-placeholder {
display: block;
width: 100%;
height: auto;
}
<div class="outer-max-width">
<div class="aspect-ratio-box">
<div class="aspect-ratio-box-content">
<img class="video-placeholder" src="https://placeimg.com/640/360/nature" />
</div>
</div>
</div>

Got it to work! I used this amazing CSS-only solution: https://codepen.io/EightArmsHQ/pen/BvNzrm similar to BugsArePeopleToo's suggestion, from eightarmshq:
.content{
position: absolute;
top: 0;
bottom: 0;
width: 100%;
height: 100%;
background: #555;
box-shadow: inset 1vh 1vh 10vh 0 rgba(0,0,0,0.5);
display: flex;
box-sizing: border-box;
border: 25px solid #cecece;
}

100vh with fallback if content higher than viewport?

Content in the viewport is fluid so when viewed on a smaller device the content height exceeds the 100vh. I was thinking of just using JS to calc the min-height of content blocks. Any ideas on a straight on if there is CSS approach? Cannot think of much... but maybe other smart folks can :-)
.content.intro {
height: 100vh;
min-height: 800px; // content can be higher than this
display: flex;
align-items: center;
justify-content: center;
margin-top: -80px;
padding-top: 80px; // adjust for the 80px header at top
}

Thanks for the comments. In this case it's a block of copy that can exceed the height of 100vh, because it's centered in flex layout it was clipping the text at smaller heights. My solution was just some simple JS triggered on load and resize:
setMinHeight : function() {
$('.content.intro').each(function() {
var bodyCopy = $(this).find('.bodyCopy'),
padTop = $(this).css('padding-top').substring(0,2),
padBottom = $(this).css('padding-bottom').substring(0,2);
minHeight = bodyCopy.outerHeight(true) + parseInt(padTop) + parseInt(padBottom) + $('header').outerHeight();
$(this).css( { 'min-height' : minHeight + 'px' });
});
}
Basically just set min-height of bodyCopy so the viewport is never smaller that the content inside it.
In my case -> content height + top/bottom padding of parent + height of header to stop overlapping

Check if element can be scrolled to the left or right

I would like to display indicators for a certain div to show that it can be scrolled right or left depending on its state. To do so I would need to know if element can be scrolled to respective positions, e.g. if there is content to be seen on the right show indicator and after scrolling show another indicator on the left to indicate that users can now scroll there as well. I have a simple setup like this one: https://jsfiddle.net/udv8u596/
(You can scroll horizontally, scrollbar is hidden intentionally)
HTML:
<div class="scroll-container">
<div class="scroll-content">
Scroll Me Horizontally Scroll Me Horizontally Scroll Me Horizontally Scroll Me Horizontally Scroll Me Horizontally Scroll Me Horizontally Scroll Me Horizontally
</div>
</div>
CSS:
.scroll-container {
width: 80%;
margin: 0 auto;
background: cyan;
overflow-y: hidden;
height: 36px;
}
.scroll-content {
padding: 10px 0;
height: 50px;
white-space: nowrap;
overflow-x: scroll;
overflow-y: hidden;
}

To check if an element is overflowing along the x-axis, you can simply compare its computed width, accessible via jQuery's .width() method, and its scrollWidth, a native JS function:
var $ele = $('.scroll-content'),
overflowing = $ele[0].scrollWidth > $ele.width();
You can then check the boolean value of overflowing if the element is overflowing or not. However, note that if you want this variable to be updated if the window resizes, a little more work has to be done:
var $ele = $('.scroll-content'),
overflowing = function() {
if($ele[0].scrollWidth > $ele.width()) {
return true;
} else {
return false;
}
};
console.log(overflowing());
$(window).resize(function() {
console.log(overflowing());
});
Here's a fiddle with the above logic implemented, with some slight modifications: https://jsfiddle.net/teddyrised/udv8u596/5/

Ilya basically you need to check your element right postion. On way of achieving this is to set the inner element to have absolute oistion and get right postion with jQuery
parseInt($('.scroll-content').css('right')) >= 0
I have modified you code as: https://jsfiddle.net/udv8u596/4/
In this example before animating the element it checks if the righ position is bigger than 0.
Please not that righ position is calculated based on the parent element. Left position is set to be 0 in the css but righ postion will be calculated in this example is ~-250.
I hope this gives you an idea how to solve your problem.

Here's a quick start for what you are looking for :
HTML
<div class="scroll-container">
<div class="mask">
<div class="scroll-content">
Scroll Me Horizontally Scroll Me Horizontally Scroll Me Horizontally Scroll Me Horizontally Scroll Me Horizontally Scroll Me Horizontally Scroll Me Horizontally
</div>
</div>
</div>
<div class="scrollRight">Scroll Right »</div>
<div class="scrollLeft">» Scroll Left </div>
CSS
.scroll-container {
width: 80%;
margin: 0 auto;
background: cyan;
overflow-y: hidden;
overflow-x: hidden;
height: 36px;
}
.mask{
position:relative;
overflow-x: hidden;
overflow-y: hidden;
height: 36px;
width: 100%;
}
.scroll-content {
position:absolute;
padding: 10px 0;
height: 50px;
white-space: nowrap;
overflow-x: visible;
width:auto;
}
.scrollRight, .scrollLeft{
font-size:10px;
display:none;
}
JS
var contentWidth = $(".scroll-content").width();
var containerWidth = $(".scroll-container").width();
if(contentWidth>containerWidth){
$(".scrollRight").show();
}
$("body").on("click", ".scrollRight", function(){
var scrollValue = contentWidth-containerWidth;
$(".scroll-content").animate({"margin-left":"-"+scrollValue+"px"});
$(".scrollRight").hide();
$(".scrollLeft").show();
})
$("body").on("click", ".scrollLeft", function(){
var scrollValue = contentWidth-containerWidth;
$(".scroll-content").animate({"margin-left":"0px"});
$(".scrollRight").show();
$(".scrollLeft").hide();
})
See Update JSFiddle

Dynamically resize div according to dynamic content?

I have a div called container which contains dynamically created content(paragraphs) through javascript. The problem is that the paragphs aren't shown on the div once they reach beyond the boundaries of the container. To solve this issue, I tried overflow but that just added x,y scrollbars.
What I'm trying to do is increase the height of the container after every parapgraph added i.e. when paragraph is added to container of height 20px, the container increases height to a further 40 px for next paragraph.
HTML
<div class="container"></div>
Add content
CSS
.container {
width: 120px;
height: 20px;
display: inline-block;
margin-left: auto;
margin-right: auto;
/* overflow: auto; */ //As aforementioned, I'm not in favour of scrollbars
background-image: url('http://i.imgur.com/dfzk0TW.png');
}
Javascript
$(function () {
$('#add').on('click', function () {
$('<p>Text</p>').appendTo('#container');
});
});
Any suggestions? Thank you!

Try this code
jsfiddle
remove height from css and use below code
$('<p>Text</p>').appendTo('.container');
remove # and put dot(.)

this code will get height of container div and than will add 20px in container div.
$(function () {
$('#add').on('click', function () {
$('<p>Text</p>').appendTo('#container');
heightWithPx = $('#container').css('height');
height = heightWithPx.substr(0,heightWithPx.length-2);
newHeight = parseFloat(height)+20;
$('#container').css('height',newHeight+'px');
});
});

Div Square, width size based on 100% height

I'm trying to make a responsive square with the width size based on the (100%) height of the element. I believe it's impossible using only CSS.
The square width should be equal to the height (100% of the large container. The large container is more than 100% of the screen). The ratio has to be width=height to keep the square.

You could do this with a tiny inline image.
No JS, no extra files.
.container {
height: 150px;
width: 100%;
text-align: center;
background: #acd;
}
.square {
display: inline-block;
height: 100%;
background: #691;
}
<div class="container">
<div class="square">
<img src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" height="100%">
</div>
</div>

For a CSS-only solution (where you're sizing relative to the screen size), use viewport units. For example:
#media screen and (orientation:landscape) {
.box{
height: 100vh;
width: 100vh;
}
}
#media screen and (orientation:portrait) {
.box{
height: 100vw;
width: 100vw;
}
}
(You may want to reduce it to 98 units to eliminate scrolling)
Works great for divs that need to take up a precise proportion of screen space.
JSFiddle here.

Take a look... at the aspect-ratio property.
This property makes creating a square div based on height, in the easiest method possible. Here's some example code:
h2 {
font-family: calibri;
}
#parent {
height: 96px;
width: 256px;
background: grey;
margin-bottom: 16px;
}
#child {
height: 80px;
aspect-ratio: 1 / 1;
background: lightgrey;
}
#anotherParent {
height: 96px;
width: 256px;
background: grey;
}
#anotherChild {
height: 50%;
aspect-ratio: 1 / 1;
background: lightgrey;
}
<h2>Absolute height (80px/96px)</h2>
<div id="parent">
<div id="child">
</div>
</div>
<h2>Relative height (50%)</h2>
<div id="anotherParent">
<div id="anotherChild">
</div>
</div>
Here are a couple of links to help you understand the aspect-ratio property:
https://css-tricks.com/almanac/properties/a/aspect-ratio/
https://developer.mozilla.org/en-US/docs/Web/CSS/aspect-ratio
https://support.squarespace.com/hc/en-us/articles/115008538927

Since a square has same width and the height, and you know the width of the square, you can apply the same value to height.
If you can use JS, then please try this: (jQuery)
var wiDth = $('div').css('width'); // get width
$('div').css('height', wiDth); // apply that value to the height
Try it here: http://jsfiddle.net/afzaal_ahmad_zeeshan/vpGUK/

You can accomplish this using javascript. I'm assuming that you have a larger div container, in which you want a square, whose height is the same height as the container. The html is as follows:
<div id="container">
<div id="square" style="height:100%;">
</div>
</div>
In javascript, you would simply do:
<script>
var container = document.getElementById("container");
var square = document.getElementById("square");
square.style.width = container.style.height;
window.onresize=function(){
square.style.width = container.style.height;
};
<script>
Hope that helps

I think this can be a good 'css only' solution for you.
Cross browser working.
http://absolide.tumblr.com/post/7317210512/full-css-fluid-squares
Good to highlight this nice css rule:
If the vertical paddings (and margins) are specified in percent (%) values the size is a percent of the width of the containing element.

Put it on your <script src="http://code.jquery.com/jquery-1.10.2.js"></script> and try with jquery:
var totalHeight = 0;
$("#yourContainer").children().each(function(){
totalHeight += $(this).height;
});
$("#yourContainer").css('width', totalHeight + 'px');

Ok here the solution.
<div id="square" style="background-color:black;height:100%">test</div>
$(window).ready(updateWidth);
$(window).resize(updateWidth);
function updateWidth()
{
var square = $('#square');
var size = square.height();
square.css('width',size);
}
http://jsfiddle.net/j372H/7/

You can assign width and height to the container like this
.container {
width: 100vh;
height: 100vh;
}
It will create a square div with 100% height and width=height.